Browsing by Keyword "Squeeze Casting"
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Item High pressure die casting (HPDC) of advanced reinforced aluminium alloys(2004-06) Goñi, J.; Eguizabal, P.; Coleto, J.; Guridi, J. R.; Garitagoitia, I.; Garitagoitia, E.; Barbarias, E.; Centros PRE-FUSION TECNALIA - (FORMER); Tecnalia Research & Innovation; MercadoAn advanced material based on a AlSi8Cu3Fe alloy reinforced with 6%wt. of Titanium Diboride (TiB2) particles was employed to produce demonstrator clutch discs and to compare the obtained properties with those of the corresponding non reinforced alloy. The new material was produced through an in-situ reaction in which two salts were incorporated into the aluminium alloy melt to produce the reinforcing particles through an exothermal chemical reaction. The material so formed was first used to obtain samples through the direct Squeeze Casting technology at lab scale. Afterwards, it was also employed to produce some demonstrator prototypes with a conventional industrial High Pressure Die Casting (HPDC) equipment. Results obtained with the reinforced material with the Squeeze Casting and HPDC technologies are presented and compared to those obtained with the corresponding non reinforced equivalent. The effect of the TiB2 particles was analysed in terms of enhancement of mechanical properties at high temperatures, thermal properties, processing, etc. Minor changes had to be implemented in the moulds and equipments used to produce the final samples and components. The melt was stirred in order to avoid the settling phenomenon that might have taken place due to the difference of the density of the particles and the alloy. The processing parameters had to be fixed in order to take into account the different viscosity, castability and solidification pattern of the new material. Information on the optimization of the casting processes and properties of the Squeeze Casting and HPDC samples obtained are shown.Item Processing of aluminium alloys in semi-solid state: A competitive technology for automotive components(2004) Goñi, J.; Eguizabal, P.; Lakehal, M.; Sarriés, I.; Akizu, A.; Landa, I.; Wielanek, L.; Azpilgain, Z.; Hurtado, I.; Centros PRE-FUSION TECNALIA - (FORMER); Tecnalia Research & InnovationThe achievement of lighter automotive components is an important driving force in the development and optimization of casting techniques. Among these, Thixocasting and Squeeze Casting of aluminium alloys are presently used in the production of security components. In the present work, several production routes and aluminium alloys are considered. A die has been designed to produce a standard security component: an automotive brake caliper. Simulation studies have been carried out to detect possible filling or solidification problems during casting and to solve them beforehand. Afterwards, automotive components have been produced with both a commercial globular structured A357 alloy through a semi-solid technology (Thixocasting) and a conventional A357 alloy by Squeeze Casting. General considerations of both casting processes are presented and some specific problems encountered are outlined. For comparison purposes, the automotive component selected has been also manufactured by means of other conventional casting technologies: sand casting, gravity die casting and low pressure die casting. Components from both sets of experiments have been heat treated and metallographic samples from problematic areas of the component selected have been thoroughly analyzed. Mechanical properties have been measured from tensile samples and the results compared for the different casting techniques evaluated.